51 results about "Shock sensitivity" patented technology

A method and system for reducing operational shock sensitivity of a MEMS device includes a closed-loop control circuit for controlling the MEMS device and a shock detector for detecting a shock experienced by the MEMS device. The closed-loop control circuit includes a movable MEMS structure, a detector for sensing a position of the MEMS structure and for providing a first feedback signal related to the sensed position, and a processor for receiving the first feedback signal and for providing a control signal used to control the MEMS device. The shock detector, which according to a preferred embodiment is the MEMS structure itself, is used for detecting the shock experienced by the MEMS device and for generating a second feedback signal, which is used to alter the control signal such that a response of the closed-loop control circuit to the shock is minimized.

The invention discloses metal fiber toughened and enhanced TNT (trinitrotoluene)-based melt-cast explosive and a preparation method thereof. The melt-cast explosive comprises components in parts by weight as follows: 30-40 parts of TNT, 60-70 parts of hexogen or octogen, 0-3 parts of metal fiber and 0-2 parts of paraffin. The preparation method comprises the steps as follows: a surfactant solution is used for treating the metal fiber; materials are compounded; the materials are placed in an explosive melting machine for mixing; and casting is performed under atmospheric pressure. The TNT-based melt-cast explosive has the mechanical properties as follows: the compressive strength is larger than or equal to 24 MPa, the compressive strain is larger than or equal to 0.33%, the compressive modulus of elasticity is larger than or equal to 9 GPa, lower mechanical sensitivity is provided, the friction sensitivity is 0%-10%, and the impact sensitivity is 20%-40%.

The invention relates to an explosive performance detection device, in particular to an explosive collision sensitivity instrument, which is mainly used for solving the problems of poor testing consistence, low testing accuracy and difficulty in ensuring the testing conditions existing in the conventional collision sensitivity testing device. The explosive collision sensitivity instrument comprises a drop hammer elevating and positioning mechanism, a drop hammer fixing and releasing mechanism, a collision device mechanism, an optically-controlled anti-secondary-collision mechanism and an integral control mechanism, wherein the drop hammer elevating and positioning mechanism comprises a base, an elevating guide rail which is vertically fixed on the upper surface of the base, an upper fixed plate which is horizontally fixed at the top end of the elevating guide rail and an elevating plate of which the end part is connected with the elevating guide rail in a sliding manner; and the drop hammer fixing and releasing mechanism comprises a drop hammer, a drop hammer sucking cover and a vacuum pump connecting pipe. The explosive collision sensitivity instrument has the characteristics of Custer and 12-type tool testing structures, can be used for detecting the sensitivity properties such as collision explosion probability, characteristic drop height and the like of an explosive, and can be used for detecting the safety performance of the explosive.

The invention relates to a fine-particle high-energy low-sensitivity explosive compound and a preparation method thereof. The method comprises the following steps: mixing an explosive with a macromolecular bonder according to a weight part ratio of 100 to (2-5), and stirring at 40-60 DEG C for dissolving in an organic solvent to obtain an explosive compound solution with 5%-30% by weight of explosives; putting the explosive compound solution into an ejection tank, pumping air into the ejection tank to increase the pressure in the ejection tank to be 0.3-0.7MPa, ejecting the explosive compound solution into an explosive antisolvent with the temperature of -10 DEG C to 10 DEG C, performing centrifugal separation on a solid product, washing, and drying to obtain the explosive compound. According to the explosive compound, explosive particles are micron-sized, the CL-20 surface is densely wrapped with the macromolecular bonder in the form of an interwoven mesh shape, the impact sensitivity of the wrapped CL-20 is reduced to be 24%-40% from 100%, and the friction sensitivity is reduced to be 66%-92% from 100%.

The invention discloses an environment-friendly firework propellant which is characterized by being composed of the following components in parts by weight: 10-65 parts of rare earth, 15-35 parts of potassium perchlorate, 10-20 parts of aluminum magnesium alloy, 5-20 parts of combustible agent, 2-5 parts of plant gum and 3-10 parts of resin, wherein the combustible agent is selected from any one or combined by any two from hemp xyloid stem carbon powder and Chinese fir carbon powder at any proportion, and the plant gum is a rice flour adhesive. The environment-friendly firework propellant is free of chlorate, small in horizontal launching force, low in moisture absorption property, low in impact and friction sensitivity, small in dosage of charges for preparing fireworks, slight in smoke, long in shelf life and displaying time, free of residues after displaying, good in physical and chemical stability, simple in processing technology and suitable for various firework propellants.

The invention discloses safe and sulfur-free firework bursting powder and propelling powder and a preparing method thereof, and relates to the technical field of fireworks. The firework bursting powder is prepared from, by weight, 15-35 parts of carbon powder, 5-60 parts of potassium perchlorate and 15-70 parts of potassium nitrate. The firework propelling powder is prepared from, by weight,15-35parts of carbon powder, 5-60 parts of potassium perchlorate, 15-70 parts of potassium nitrate, 5-10 parts of adhesive and a proper amount of solvent. The firework bursting powder and propelling powderdo not contain sulfur, metal, benzene or the like, have no toxicity, reduce the air pollution, generate less smoke, have zero percussion sensitivity and friction sensitivity, guarantee safety and environmental protection, have a low moisture absorption rate and stable performance, reduce the ignition point properly, have flammability, high safety performance and propelling performance, do not easily cause barrel blasting, and reduce the production cost; the preparing method of the sulfur-free firework bursting powder and propelling powder is simple and safe.

The invention discloses a sulfur-free environment-friendly gun propellant which comprises the following components in parts by weight: 65 parts of potassium acid phthalate, 15 parts of hemp stem carbon powder, 10 parts of an epoxy resin, 2 parts of graphite powder and 5 parts of lime. The gun propellant manufactured according to the formula is applied to display shells, potted flowers, colored bead barrels, display shell rocket propulsion powder and the like. The sulfur-free environment-friendly gun propellant is excellent in safety performance indexes, the friction sensitivity and percussion sensitivity degree are zero, and the potential safety hazards are eliminated; according to the formula, the sulfur component is completely eliminated, so that pollution of sulfur dioxide and sulfides on the environment is eliminated during firework display; and moreover, the gun propellant does not contain forbidden materials; and the environmental protective performance is greatly improved.

The invention provides a safe environment-friendly colorful firecracker reagent and a method for preparing a colorful firecracker by using the reagent. The colorful reagent comprises a component A and a component B. The manufacturing technique is implemented by coating the component B on the component A. The reagent is free of potassium chlorate or any other national forbidden component, and is free of sulfides. In the firecracker prepared by the method, the component A is coated with the component B, and the component B has the functions of heat insulation, water resistance, collision prevention and the like, thereby overcoming the defect that the component A can be easily moisturized, can be easily exploded by impact, can easily generate spontaneous combustion due to high temperature and the like. Thus, the firecracker has the characteristics of high reaction speed, clear sound, multiple colors, low impact sensitivity, low friction sensitivity, low flame sensitivity, high ignition temperature, high safety, no sulfur and the like.

The invention discloses a testing device for measuring the impact sensitivity and friction sensitivity of an energetic material. The testing device comprises a case, a servo motor, an air pipe and a pneumatic knocking hammer, wherein an air outlet pipe orifice of the air pipe is communicated with an air inlet of the pneumatic knocking hammer in a sealed manner; a test sample impact testing cavity corresponding to the pneumatic knocking hammer is formed in the right side of the bottom of the case; an impact rod component is movably mounted in the test sample impact testing cavity, and an impact column component is arranged corresponding to the impact rod component; the servo motor, a lead screw and an ejector rod are sequentially connected; a test sample friction testing cavity is formed in the test sample impact testing cavity; a sliding column sleeve is movably mounted in the test sample friction testing cavity; a left sliding column and a right sliding column are arranged in the sliding column sleeve; an energetic material friction sensitivity test sample is arranged between the left and right sliding columns; the positions of the bottom of a piston hammer body of the pneumatic knocking hammer and the outer wall of the test sample friction testing cavity correspond to each other. The device has the characteristic of multifunction, and can be used for simultaneously testing the impact sensitivity and friction sensitivity of the energetic material.

The invention discloses a safe and environment-friendly launched medicinal composition. The safe and environment-friendly launched medicinal composition comprises the following raw materials in partsby weight: 78-88 parts of wood pulp nitrocellulose, 5-10 parts of azidonitramine, 1-3 parts of a first desensitizing agent, 2-5 parts of a second desensitizing agent, 1-3 parts of a stabilizing agent,0.5-1.5 parts of an adhesive and 3-7 parts of a solvent. The launched medicinal composition provided by the invention has the friction sensitivity and impact sensitivity of 0, the moisture absorptionrate being lower than 1%, does not contain sulfur in components, has the thrust being 5-7 times that of the conventional black powder, is small in environment pollution and high in safety performance, has relatively good safety, stability, heat resistance, cold resistance and other properties, can meet using requirements, and has a relatively good market application prospect.

The invention provides a composite oxidant for fireworks. The composite oxidant consists of the following raw materials in percentage by weight: 20 to 55 percent of potassium perchlorate, 40 to 65 percent of barium nitrate, 1 to 10 percent of monobase powder and 2 to 8 percent of ferric oxide. The composite oxidant for the fireworks has safe performance and low price; the moisture absorption rate is less than 1 percent; the friction sensitivity and the impact sensitivity are zero; and the fireworks produced by the oxidant have the explosion rate and the paper breaking rate of over 98 percent and have safety, stability and long storage time.

The invention provides propellant powder and a preparation method. The propellant powder comprises 30-50 parts of potassium permanganate, 8-20 parts of a binding agent, 10-20 parts of potassium hydrogen phthalate and 20-40 parts of a combustible agent, wherein the combustible agent is a mixture of nitrocotton and charcoal powder. The propellant powder has low friction sensitivity and impact sensitivity, low moisture absorption rate and strong thrust and meanwhile reduces the environmental pollution.

The invention discloses a performance estimating system of an energy-containing compound. The performance estimating system comprises (1) a data management module, (2) a data preprocessing module, (3)a model establishing and evaluating module and (4) a performance estimating module. The system is used for querying and estimating the performance of density, formation enthalpy, detonation speed, detonation heat, detonation pressure and impact sensitivity of the energy-containing compound, and has the advantages of convenient use, fast and accurate performance estimation and the like.

The disclosure relates to embodiments of an explosive formulation comprising a detonable mixture of an oxidizing agent such as carbon dioxide, and a material that decomposes the oxidizing agent exothermically (a reducing agent), and additives that increase the mixture's shock sensitivity. The formulations may be used in a method to produce diamonds or nano oxides or in other applications that use traditional explosives such as, but not limited to: ammonium nitrate and fuel oil combinations (ANFO), watergel explosives, emulsion explosives and RDX.

The invention proposes a trinitride and a synthesis method thereof, and application thereof as a heat-resisting initiating explosive. The chemical name of the trinitride is azide cadmium, the molecular formula is Cd(N3)2, the trinitride reacts through a cadmium nitrate solution and a sodium azide solution under the conditions of required reaction temperature, material ratio, charging sequence, reaction time and pH value of a reaction solution, so as to obtain the azide cadmium. The performance of the azide cadmium is subjected to comprehensive assessment by a test. The impact sensitivity of carbonic anhydrase (CA) is equivalent to that of lead azide while the friction sensitivity and the static-electric sensitivity are more insensitive than those of the lead azide; the decomposition peak temperature of the CA is higher than that of the lead azide, and achieves 334-370 DEG C; the explosion temperature can be up to 417-426 DEG C; the initiating power of the CA is much stronger than that of the lead azide. Thus, the CA can be applied to heat-resisting detonators and various miniature detonators instead of the lead azide.

The invention provides a propellant and a preparation method thereof. The propellant is prepared from the following components: 30-50 parts of potassium permanganate, 8-20 parts of binder, 10-20 partsof potassium hydrogen phthalate and 20-40 parts of combustible agent, wherein the combustible agent is a mixture of magnesium powder and charcoal dust. The propellant is low in friction and impact sensitivity, small in moisture absorption rate, high in thrust and also capable of reducing environmental pollution.

The invention discloses an oxidizer for firework explosive agent and preparation thereof. The oxidizer consists of the following mass components: 20 to 50 percent of potassium perchlorate, 0 to 30 percent of potassium nitrate, 30 to 50 percent of barium nitrate mixture and 1 to 5 percent of complexing agent, wherein the complexing agent is tartaric acid or potassium sodium tartrate. The fireworks manufactured by using the oxidizer is characterized in that: the burn rate is over 98 percent; the sound level ranges from 100dB to 140dB; the pressure of gas product rises from 0.69MP to 2.07MP within 1.74ms and the pH value of pyrotechnic composition is between 5 and 9; the water content is less than or equal to 1.5 percent; the regain is less than or equal to 2.0 percent; the thermal stability ensures a decomposing phenomenon does not occur at 75+/-2DEG C within 48 hours; the friction sensitivity is less than or equal to 40 percent; and the sensitivity to impact is less than or equal to 0 percent. The oxidizer meets the requirements of national standards of Firework Safety and Quality. The manufacturing process of the oxidizer is simple, the cost is low and the application prospect is good.

A rubber type high-temperature metal particle generator is prepared from components in weight ratio as follows: 1%-6% of an adhesive, 45%-60% of an oxidizing agent, 30%-40% of fuel, 1%-4% of a desensitizing agent, 0%-2% of a plasticizer, 4%-10% of a burning temperature regulator and 0.5%-2% of a property modifier. The generator needs no curing crosslinking and has short production cycle and low cost. Compression molding property of the generator is good, room-temperature one-way compression is performed, and density of a generator grain is 98.5% (phi 40 mm) of the theoretical density when specific pressure is lower than 240 MPa. Metal particles generated by the generator are at the temperature of about 1800-2200 K and have density higher than 2.0 g/cm<3>, friction sensitivity lower than 20% and shock sensitivity of 0.

The invention provides a propellant and a preparation method. The propellant is prepared from the following components: 30-50 parts of potassium permanganate, 8-20 parts of an adhesive, 10-20 parts ofpotassium hydrogen phthalate, 20-40 parts of a combustible agent and 5-10 parts of iron(II,III) oxide, wherein the combustible agent is a mixture of pearl powder and charcoal powder. The propellant has low friction sensitivity and impact sensitivity, low moisture absorption rate and strong thrust, and environmental pollution is reduced.

The invention discloses a preparation method of a high-energy explosive filled three-dimensional graphene frame composite structure. A three-dimensional graphene frame structure prepared by reductionand self-assembly of a two-dimensional graphene oxide nano material is used as a template, and a high-energy explosive solution is introduced into the three-dimensional graphene frame structure. Thenthe explosive solution is recrystallized in the frame structure of the template by utilizing an external acting force, and the formed explosive crystal grows in a limited space of the frame structurein an oriented manner. Finally, an explosive filling frame composite structure is contructed, and an explosive solution is added for multiple times to crystallize, thereby obtaining the high-energy explosive filling three-dimensional graphene frame composite structure. According to the method, the dispersity of graphene in the composite explosive system can be improved, the mass and heat transfercharacteristics of the composite system are improved, the impact sensitivity, the friction sensitivity and the electrostatic spark sensitivity of the explosive are effectively reduced, and the safetyperformance is improved.

The invention discloses an explosive recrystallization preparation method and a device for explosive crystallization. An explosive stock solution is poured into a grille crystallizing pan, and then the grille crystallizing pan is placed in a precise constant-temperature heating water tank, heated to 59-61 DEG C and kept at the constant temperature; a top-end air suction system is started, and the air suction speed is stabilized at 0.73-0.77 m/s, so that all explosives are crystallized. The device for explosive crystallization comprises the precise constant-temperature heating water tank, the grille crystallizing pan and the top-end air suction system, wherein the grille crystallizing pan is placed in constant-temperature water in the precise constant-temperature heating water tank, so that the periphery and the bottom of the grille crystallizing pan can be heated by the constant-temperature water, the top-end air suction system is arranged right above the grille crystallizing pan, and a grille of the grille crystallizing pan is arranged on the inner bottom surface of the grille crystallizing pan. The method and the device have a function of precisely controlling the temperature and the volatilization speed of the recrystallized stock solution, the initiation sensitivity of prepared explosives is obviously improved, the shock sensitivity is greatly reduced, and the production efficiency is substantially improved.

The invention provides a composite explosive structure and a forming process. The composite explosive structure comprises mixed crystal particles, and the mixed crystal particles are coated with a coating film; the mixed crystal particles comprise CL-20 explosives and aluminum powder, and the CL-20 explosives and the aluminum powder are locally bonded through a binder; and the coating film is composed of paraffin, talcum powder and sodium dodecyl benzene sulfonate. The mixed crystal particles are realized through mixed crystal dispersion and mixed crystal kneading processes; and the coating film is realized through solution preparation and paddle-free mixing processes. The composite explosive structure has high detonation output capacity, and compared with conventional mixing of blended explosives in the same proportion, the temperature of an explosion field is increased by 100 DEG C or above; the Gurney coefficient is increased by 5%; and the shock wave overpressure is improved by more than 10%. The composite explosive structure provided by the invention has high safety, and the impact sensitivity and the friction sensitivity are reduced by more than 10% compared with a same-proportion crystal embedding structure and a conventional mixed structure.